Mercury, the first planet from the sun, is about to be really easy to spot for a short snippet of time in the night sky next ...

Astronomers have discovered nearly 6,000 planets beyond our own solar system. Here's how — and how we'll find even more.

For a few evenings around 28 February, every planet in the solar system will be visible in the night sky, thanks to a rare ...

Most of the planets are aligned in our night sky right now, providing a treat for skywatchers. Are such "planetary parades" ...

"We found that some comets in the inner Oort cloud form a long-lasting spiral structure." Spirals are a repeating theme in ...

"It's like a game of billiards around the solar system, flying by a couple of planets at just the right angle and timing to ...

It is about a third closer to its star than our solar system's innermost planet Mercury is to the ... exoplanet's atmosphere ...

Mercury has a rocky surface when, facing the sun, can reach highs of 800 degrees while overnight lows could reach minus 290 ...

Venus, Mars, Jupiter, Saturn, Uranus, and Neptune were already visible in the night sky after dusk this month, but Mercury joined them on Feb. 28. While it's common to see a few planets line up in the ...

Seven planets grace the sky at the end of February in what’s known as a planetary parade, though some will be difficult to ...

Seven planets will align in a rare planetary parade, offering a view of five planets visible to the naked eye in the night ...